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acid hydrogen

n.
1.a hydrogen atom in an acid that forms a positive ion when the acid dissociates

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    Idiom of the Day

    have a heart of gold
    to be generous or sincere or friendly
    The woman has a heart of gold and is always willing to help her friends.



    1.
    Choose an idiom to replace the expression in the brackets:
    I opened up a (complicated problem) when I began to talk about my salary with my boss.

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